Pathfinder has a section on
Intentionally Crafting Cursed Items.
As I don't really want my personal equipment in the hands of others, I do that.
So for all the items intended for personal use, I (or my crafting minions) add:
1) Requirement: Must have a specific skill (Spellcraft, which I have natively, needed for crafting).
2) Intermittent Functioning(Dependent): Within ten feet of a half-elf (I qualify due to Racial Heritage, and I am always within ten feet of myself, and so is any item I carry)
3) Intermittent Functioning(Dependent): Within ten feet of a Divine Caster (which I am, and again: I am always within ten feet of myself)
As a bonus, I get a discount that way (which theoretically also applies to crafting time, as it changes the market price, and the write-up for deliberately cursed items included making money quickly).
1) 10%
2) 30%
3) 30%
Depending on which math this aspect uses (real world or D&D maths), that's either a 30% of normal cost and time (1-0.10-0.30-0.30=0.30) 44.1% of normal costs (0.9×0.7×0.7=0.441)